M-7 Single Door Leaf

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M-7 Single Door Leaf

Postby newkirk » Thu Jun 22, 2017 6:42 pm

Anyone know why the M-7's went with the single door leaf as opposed to double door leafs ?

Sorry if this question was brought up before. I occasional read posts here.
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Re: M-7 Single Door Leaf

Postby DutchRailnut » Thu Jun 22, 2017 6:46 pm

less maintenance ?? less cost (electric operator)
If Conductors are in charge, why are they promoted to be Engineer???

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Re: M-7 Single Door Leaf

Postby BuddR32 » Fri Jun 23, 2017 12:13 am

Like Dutch said it eliminated 50% of the door operators and related stuff. Less maintenance, and less to fail. The double door leafs on the M3 do not provide any redundancy, as if one leaf fails the railroad must cut out both leaves, so you still lose the door.
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Re: M-7 Single Door Leaf

Postby Head-end View » Sun Jun 25, 2017 7:05 pm

The single leaf door is also better as an emergency exit so only one door has to be opened manually or using the emerg. mechanism. My single objection to them is that the opening/closing machinery is extremely noisy; ya' know that mechanical whine from the jackscrew. The double doors used a different system and were quiet opening and closing making for a much more pleasant riding experience.
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Re: M-7 Single Door Leaf

Postby BuddR32 » Mon Jun 26, 2017 5:05 am

Head-end View wrote:The single leaf door is also better as an emergency exit so only one door has to be opened manually or using the emerg. mechanism. My single objection to them is that the opening/closing machinery is extremely noisy; ya' know that mechanical whine from the jackscrew. The double doors used a different system and were quiet opening and closing making for a much more pleasant riding experience.


It instantly and still reminds me of the noise the Three Stooges make.
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