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Double handle controls issue

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Double handle controls issue Empty Double handle controls issue

Post by Delsin Wed Mar 10, 2021 2:00 am

Power handle doesn't move when brake handle isn't in B0.

On another hand thought it could be a feature, but in most cases irl it's only power handle and it's interlocked with reverser Very Happy
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Post by leezer3 Wed Mar 10, 2021 12:00 pm

Fixed.

Minor oversight when moving some code to the handle properties.

You're right though, should be a feature, so added it Razz
New handle type available of Separated (Interlocked) which prevents the power handle being moved from N if the brake is applied. (If power is in use, the setting will be maintained, but returns to N if the handle position is modified)

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Post by Delsin Wed Mar 10, 2021 7:38 pm

Not sure if there are any separate handle trains with this kind of interlock, usually it's reverser and power/combined handle with 3 possible scenarios:
- 2 handles, power handle can only be moved with reverser in F or R, reverser can't be moved if handle isn't in 0
- combined handle, can only be moved with reverser in F or R, reverser can't be moved if handle isn't in coast
- combined handle, can only be moved with reverser in F or R, reverser can't be moved if handle isn't in emergency or handle off (if it's provided) position

Speaking of handle off, there are 2 common options too, before emergency notch and behind it.

I try not to get into more detail like auto brake positions behind EPB, interlocking with a control switch/key and more "non-Japanese" combos like combined handle on one side and air brake valve on another, or split levers for air and dynamic brake that can be linked and unlinked Smile
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Post by leezer3 Wed Mar 10, 2021 8:31 pm

I suspect stuff like this really depends on the exact form of interlocking (and hence the method chosen to simulate it), and gets very manufacturer / age specific in a hurry.
It seemed a reasonable compromise to add. Reverser interlocking shouldn't be difficult either, will think about that, and this some more.....

FWIW, the specific case I was thinking of here was some of the much more modern stuff (post microprocessor, I'd guess the past 20 odd years of designs), which now has hill-start buttons, as opposed to the original practice of holding on the brakes and applying power.

Whether there's actually physical interlocking in there WRT to the power handle, I don't actually know.

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Post by Delsin Wed Mar 10, 2021 8:52 pm

Normally these 3 primary interlocking algorithms are implemented purely mechanically.
Btw, think brake priority (whether train tries to apply power with brake handle not in 0) should be an option too
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Post by Quork Thu Mar 11, 2021 9:27 am

Never say never, but I'd be rather surprised to see a train with such interlocking. Not applying power if the brake handle isn't in 0 - yeah, sure, I can see that. There are even locomotives not applying power as long as there's pressure in the brake cylinder, e.g. some GDR-produced engines, unless the override button (used e.g. in inclines) is pressed; most notably class 143 and relatives. But physically blocking the handle from being moved, I don't think so.

Reverser interlocking on the other hand is pretty standard, especially on vehicles from before ~ 2000 (in Germany loco class 101 is the latest I know with this interlocking, built starting in 1996; and EMU class 411 the oldest without, built also starting in 1996). The power handle is locked in 0 with the reverser in 0 (and, where present, in M) and the reverser is blocked in its position with the power handle out of 0.
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Post by leezer3 Thu Mar 11, 2021 12:31 pm

Reverser interlock added Smile

(These are at least easy, and require no major internal plumbing to sort out)

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