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 Post subject: Diesel hood units-why two doors?
PostPosted: Sat Oct 09, 2021 7:38 pm 

Joined: Mon Aug 23, 2004 2:28 pm
Posts: 370
I was wondering if anyone can shed some light on this. Considering that with a diesel locomotive hood unit, you've got 4 walkways-2 on either side of the cab on the short hood side, and 2 on either side of the cab on the long hood side.

Does anyone know the background as to why design was standardized with only 2 doors (fireman's side facing the short hood; and engineer's side, facing the long hood)?

TIA!


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 Post subject: Re: Diesel hood units-why two doors?
PostPosted: Sat Oct 09, 2021 9:22 pm 

Joined: Fri Dec 22, 2017 6:47 pm
Posts: 882
Location: Philadelphia, PA
For a dual-control unit, both doors are on the fireman's side facing the direction of movement. (that's the same location you described)

This is to keep a solid wall in front of the engineer which will keep the rain/snow and cold wind from blowing around the door into the cab and onto the control stand (and engineer). It will blow into the fireman's side but you need a door somewhere and the engineer has to stay at the controls.

Also, no one has any reason to walk through the engineer's work space.

Phil Mulligan


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 Post subject: Re: Diesel hood units-why two doors?
PostPosted: Mon Oct 11, 2021 8:53 am 

Joined: Mon Aug 23, 2004 2:28 pm
Posts: 370
Thanks, Phil!

Considering that there maybe weren't so many dual-control units out there, I would think three doors (2 on fireman's side) might have made more sense. As to a second door on the engineer's side, fair enough (even though steam locomotives often had doors in front of the engineer).


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 Post subject: Re: Diesel hood units-why two doors?
PostPosted: Tue Oct 12, 2021 1:51 pm 

Joined: Thu Feb 26, 2009 3:07 pm
Posts: 823
Location: B'more Maryland
How often does someone need to walk out of the cab and have direct access to that side of the hood?

Not very often.

So one door suffices for economy and reliability.

Beyond simply requiring more construction time an additional door means increased complexity with air operated wipers, additional seals that can go bad, and of course, an additional source of drafts. That's not really worth it if there's no need to quickly access the hood there.

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