An Underwood portable boring machine. The H.B. Underwood Company made a lot of portable locomotive machines mainly for short lines without extensive shop facilities.

http://vintagemachinery.org/mfgindex/im ... px?id=3922

Well, now that we know where to get the parts, here are some books on what to do with the parts.

Track standards 1910
by Rehm, Norman F., ed

https://archive.org/details/trackstanda ... road+frogs

Practical track work 1915
by Van Auken, Kenneth L 1885-

https://archive.org/details/practicaltr ... road+frogs

The Road-master's Assistant and Section-master's Guide: A Manual of ...
by William S. Huntington , Charles Latimer

https://archive.org/details/roadmasters ... road+frogs

The trackman's helper. A pocket companion for track foreman generally ..1891
by Kindelan, Joseph

https://archive.org/details/trackmanshe ... road+frogs

Here are 3 Sweets catalogues spanning the years 1917-1933. There are many differences between the 3 so check them out.

Sweet engineering catalogues : a file of manufacturers' catalogues of industrial building products, power plant equipment, material handling equipment, factory equipment.
by Sweet's Catalogue service

https://archive.org/details/sweetsengin ... +regulator

https://archive.org/details/SweetsEngin ... catalogues

https://archive.org/details/SweetEngine ... or+catalog

The Progress of Marine-engineering: From the Time of Watt Until the Present Day. With Sixty ...
by Thomas Main 1893

https://archive.org/details/progressmar ... am+engines


Steam boilers, engines and turbines 1908
by Walker, Sydney Ferris

https://archive.org/details/steamboiler ... am+engines


Steam And Other Engines 1907
by Duncan J

https://archive.org/details/in.ernet.dl ... am+engines


Steam and Its Uses: Including the Steam Engine, the Locomotive, and Steam ...
by Dionysius Lardner 1856

https://archive.org/details/steamandits ... am+engines

L.M.Rumsey MFG Co.: Illustrated catalogue of plumbers, gas and steam fitters, machinists, engine builder and railroad supplies. 1885
by L. M. Rumsey Co.

https://archive.org/details/L.M.RumseyC ... m+fittings


Eclipse steam specialties, catalog D. 1920
by Illinois Engineering Co

https://archive.org/details/IllinoisEng ... ure+gauges


Lidgerwood cableways for hoisting and conveying : this section of the cableway catalog shows typical installations of Lidgerwood cableways for building dams and locks
by Lidgerwood Manufacturing Company. 1912
https://archive.org/details/LidgerwoodC ... y+catalogs