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Why do EMUs have bells and DMUs have buzzers?

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Starmill

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RIGHT you lot! Making me think I don't know my 323s! They have buzzers in the cabs, yes, but at the door control panel under the panto in the middle carriage, the noise is definitely a beep sound.

It reminds me of what I think I heard on a 350, hence my first post, but I think I might have heard similar on a 378. Can't be sure though. Northern 323 btw.
 

TEW

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150s and 455s have different sounds at intermediate door controls where fitted too. 150s have buzzers in the cabs and original door control panels and 455s have bells in the cabs and original door control panels. Both have beeps in the new intermediate door controls where fitted.
 

BestWestern

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Interesting thread this one! I personally much prefer the 'beeper' as found on class 150 saloon control panels to the harsh 'buzzer' at the cab ends and on other similar era DMU stock. A 'beep' just sounds more modern and pleasant to me. A problem with the buzzer is that after a while they start to get very fuzzy, and it really is quite a pathetic sound when they're knackered!

On the plus side, there is a distinct difference between a buzzer and the cab-to-cab beep, wheras things can get a tad complicated when it all sounds the same! The worst offender being the HST, on which there is just the one 'beeper' in the cab and no door/brake interlock, meaning the Guard has to dump a passcom before trying to contact the Driver ('call' code 3-3) in case he thinks you want him to draw forward (buzzer code 6) and moves the train with all the doors open :o
 

Galvanize

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I often wondered why the signal to start on an EMU on the mainline was two bells while on the Underground it was one.
So if One on the bell was "ready to start" on LUL when trains used to have guards, what was the emergency stop signal?!

Or did the guard keep pressing the bell like a maniac in order to get the driver's attention?! :lol:
 

bronzeonion

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So if One on the bell was "ready to start" on LUL when trains used to have guards, what was the emergency stop signal?!

Or did the guard keep pressing the bell like a maniac in order to get the driver's attention?! :lol:

I think that was the guards responsibility as there was an emergency brake handle on or near the guards panel.
 
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