Well, according to their 2019 Spring Power Up event page, the Plymouth was advertised to be out and about, so it's a safe assumption that it is operational, or at least in VERY recent times was operational.

http://www.ctamachinery.com/2014-spring-power-up.html

Ok RYPN friends - after some fairly extensive research, here's what I have - list current as of today, I believe. There are a few question marks where I haven't heard back or it seems to be recently operable - there were a few from earlier in the thread that are or are not operating, I may not have included it due to its questionable status:

Arizona Railway Museum, Chandler, AZ: 20-ton Plymouth, #81, operable (museum also has second Plymouth being fixed up for operation)

Laws Railroad Museum, Bishop, CA: operable 3 ft. gauge Plymouth, used for private events, kids birthday parties and such

El Dorado Western Railway, El Dorado, CA: 22-ton Plymouth, operable, pulls train rides

Roaring Camp & Big Trees Narrow Gauge Railroad, Felton, CA: Two operable Plymouths - both 3' gauge. 14-ton Plymouth – shop shuttle and off-season weekday motive power - also 12-ton Plymouth, purchased from McHugh Locomotive & Equipment, which had been leased in Como, CO.

Santa Clara River Valley RR Historical Society, Fillmore, CA: 10-ton Plymouth, may be operable?

Ardenwood Historic Farm, Fremont, CA: #1, 5-ton Plymouth, operable, used for MOW work and regularly-scheduled train rides

Railtown 1897 State Historic Park, Jamestown, CA: 8-ton Plymouth, operable, used for switching moves and pulling equipment into and out of the roundhouse

Nevada County Narrow Gauge Railroad Museum, Nevada City, CA: Two Plymouths - #1, 8-ton Plymouth, and #10, 5-ton Plymouth, both operable

Southern California Railway Museum, Perris, CA: 3 ft. Gauge Plymouth, operable and used for switching narrow gauge equipment

Ryan Mining Camp, Ryan, CA: BL model Plymouth mining locomotive, 24” gauge, currently operable

California State Railroad Museum, Sacramento, CA: Two Plymouth locomotives, one 24” gauge, one 36” gauge, operable, but kept in Collections and not used

Niles Canyon Railway, Sunol, CA: 10-ton Plymouth, #103, currently stored but operable

Colorado Railroad Museum, Golden, CO: 25-ton Plymouth, narrow gauge – currently operable

Gray Granite Railroad, Glastonbury, CT: 40-ton Plymouth, primary motive power for train rides – currently operable

Connecticut Antique Machinery Association, Kent, CT: 3 ft. gauge Plymouth – currently operable

Lahaina, Kaanapali and Pacific Railroad, Lahaina, HI: 40-ton, 3 ft. gauge Plymouth – currently operable, used for switching

Silver Creek & Stephenson Railroad, Freeport, IL: 12-ton Plymouth – operable and occasionally used for switching

Hesston Steam Museum, La Porte, IN: Three Plymouths – One 36” gauge and two 24” gauge Plymouths, a mix of 10-ton and 12-ton locomotives – all operable

Fort Wayne Railroad Historical Society, Fort Wayne, IN: 50-ton Plymouth locomotive – currently operable

Iowa Trolley Park, Clear Lake, IA: 25-ton Plymouth locomotive – currently operable, used for occasional rides

Midwest Central Railroad, Mt. Pleasant, IA: Two Plymouths, both 25-tons, both 36” gauge – D14, operable, used for switching, pulling trains – D9, can move under its own power as of January 2020, but needs more work to be service-ready

Great Plains Transportation Museum, Wichita, KS: 35-ton Plymouth locomotive – operable, alternates as motive power for short train rides

Railway Museum of Greater Cincinnati, Latonia (Covington), KY: 18-ton Plymouth – operable, used occasionally for switching, but has a cracked exhaust manifold (as of Jan 2020)

Kentucky Railway Museum, New Haven, KY: Three 10-ton Plymouths - one owned by museum and operable, used for shop switching - one owned by museum and inoperable, but could be made to operate with few repairs - one privately owned and operational as well (as of Feb 2020)

B&O Railroad Museum, Baltimore, MD: Former Domino Sugar Plymouth locomotive - donated operable

Ali Ghan Shrine Railroad – Cumberland Shriner’s Club, Cumberland, MD: 10-ton, 3 ft. gauge Plymouth – operational, pulls trains for private events at club

Tuckahoe Steam & Gas Association, Easton, MD: Two Plymouth locomotives – one 5-ton and one 10-ton, both 3 ft. gauge, both operational

Walkersville Southern Railroad, Walkersville, MD: 60-ton Plymouth CR-4 locomotive, recently acquired and operable

Wiscasset, Waterville & Farmington Railway, Alna, ME: 12-ton Plymouth, operable, used when steam is not running

Sandy River & Rangeley Lakes Railroad, Phillips, ME: 7-ton Plymouth #14, 24” gauge, operable (needs minor repairs), used for occasional tourist service and switching

Boothbay Railway Village, Boothbay, ME: Plymouth, 24” gauge, operational, used in weekday tourist service

Maine Narrow Gauge Railroad & Museum, Portland, ME: 9-ton Plymouth, #11, operational, backup used for work trains

Little River Railroad, Coldwater, MI: Two 25-ton Plymouths, #220 and #330, both operable, used for shop/yard switching

Greenfield Village, Dearborn, MI: 1927-built Plymouth: operable, used for switching

Huckleberry Railroad, Genesee Township, MI: Two Plymouths, #11 and #571, currently operable

Houghton County Historical Museum, Lake Linden, MI: operable Plymouth HSG

Toonerville Trolley, Soo Junction, MI: Three operable Plymouths, all 2 ft. gauge 5-ton locomotives, pulling passenger trips.

Nevada State Railroad Museum, Boulder City, NV: 3 ft. gauge Plymouth, DL-2 mining locomotive – maybe operable

Nevada State Railroad Museum, Carson City, NV: 8-ton standard gauge Plymouth, operable, shop switcher

Pine Creek Railroad, Allaire State Park, Allaire, NJ: 7-ton Plymouth, 3 ft. gauge, operable, used on work trains

NYS&W Technical & Historical Society in Phillipsburg, NJ: 18-ton Plymouth – potentially operating

Morristown & Erie Railroad – Currently at Whippany Railroad Museum, Whippany, NJ: 18-ton Plymouth – Currently on display at museum, Operable?

Handy Dandy Railroad, Denton, NC: 5-ton Plymouth locomotive, recently operable, used for MOW work

Northern Ohio Railway Museum, Chippewa Lake, OH: 10-ton Plymouth DDT locomotive, operable, used for various things around museum

Midwest Railway Preservation Society, Cleveland, OH: Plymouth DGT locomotive, currently operable, used as roundhouse switcher

Orrville Railroad Heritage Society, Orrville, OH: 8-ton Plymouth, operable, heavily modified

Cedar Point & Lake Erie Railroad, Sandusky, OH: Operating Plymouth, disguised as a steam locomotive, used in shop switching and work train service

Sumpter Valley Railroad, Baker City, OR: Two narrow-gauge Plymouths - #110, 10-ton Plymouth, and #118, 15-ton Plymouth, both narrow gauge and operable

Foster Brook & State Line Railroad, (undisclosed location in Northwest PA): 2 ft. gauge Plymouth, operational, extremely private railroad, invitation only

Maryland & Pennsylvania Railroad Historical Society, Muddy Creek Forks, PA: 8-ton Plymouth, operable, used a few times per year for light switching in yard

East Broad Top Railroad, Orbisonia, PA: Two narrow-gauge Plymouths – M-4, a 12-ton Plymouth, and M-6, a 16-ton Plymouth – both recently operable

Colebrookdale Railroad, Pottstown, PA: 30-ton Plymouth, used for switching cars, maybe occasional trips?

Bucksgahuda & Western Railroad, St. Mary's, PA: 10-ton Plymouth locomotive used for various occasions on this private railroad

Stewartstown Railroad, Stewartstown, PA: 35-ton Plymouth, nicknamed "Mighty-Mo" in active tourist-hauling service

Strasburg Railroad, Strasburg, PA: Two Plymouths - #1, 20-ton Plymouth used for switching (and every now and then a mainline jaunt) - also #2, 10-ton Plymouth used for switching

Railroad Museum of Pennsylvania, Strasburg, PA: 18-ton Plymouth locomotive, operational, used for shop/yard switching

Chain Circle Shortline Railroad, West Penn Township, PA: 35-ton Plymouth, operable, standard-gauge private railroad of a few hundred feet

Doe River Gorge – East Tennessee & Western North Carolina Railroad, Hampton, TN: Plymouth HSD locomotive, 36” gauge, operable, used for pulling day camp trains

Inland Northwest Rail Museum, Reardan, WA: 3.5-ton Plymouth, narrow-gauge, operational, pulls short train ride at museum

Lake Whatcom Railway, Wickersham, WA: 30-ton Plymouth, privately owned, operable, occasionally used for switching or pulling a caboose/passenger car on trips

Durbin & Greenbrier Valley Railroad, Belington, WV: 30-ton Plymouth, operable (needs one repair as of Jan. 2019), used for switching at shops

Circus World Museum, Baraboo, WI: 30-ton Plymouth, nearly operable (under repair as of Dec. 2019), used for switching at museum

Mid-Continent Railway Museum, North Freedom, WI: 18-ton Plymouth, operable, used as shop switcher

We were just talking about these over on the Dodge truck board. LOL Perhaps the guys who work here can help get your old Plymouth back on the road...

http://plymouthlocomotiveservice.com/

This just in from Facebook about the NG one in Como, CO:

Historic Jefferson Railway, Jefferson, TX has a 3-foot gauge Plymouth gas-mechanical "Critter." It hauls a diminutive tourist train in lieu of their recently-sold Crown 4-4-0 steamer.

https://www.facebook.com/HistoricJeffersonRailway/photos/a.223184084390446/2269299986445502/?type=3&theater

Small update on Mid Continents 18 Ton Plymouth. I do not think this has run since before the 2008 flood. It was drained of flood water in 2008 and again after the last two floods in 2018. But it has had no TLC in some time. The bearing caps were removed and drained, as well as transmission and its Climax motor. I need to get under it and lube the drive chain as it is very rusty and needs to be greased or oiled. One day it isn't going to want to turn the wheels. When this thing ran it was like the circus had come to town, a lot of unique noise. People just stared at it wandering what it was. Actually a very interesting critter far as I am concerned. Regards, John.

I had an update/addition to the list above - Kentucky Railway Museum, in New Haven, IN was added.

Updated to include Northern Ohio Railway Museum entry!

There's a private 36" railroad in Dresden, OH which is operated once a year as the "Education of Yesterday" farm show.

They have what appear to be two operable Plymouths of unknown origin other than one seems to be lettered "Ball Powder". The other has no markings and in fact has had some questionable looking cosmetic changes to make it look like a steam outline.

Added info to the list about the Gray Granite Railroad, in CT and their operable Plymouth, as well as a Plymouth acquisition by the Roaring Camp and Big Trees Railroad!

folks,
anyone with an interest in Plymouh or any other Dinkys should get hold of Critters, Dinkys & Center Cabs by Jay Reed. He also has a web site listing dozens of small gas and Diesel locomotives.

as this list shows there sure are a lot of them around and about!

Ted Miles, narrow gauge fan in any form.