How many trains are there left that have noisy compressors? The 315s are the only ones I can immediately think of although I haven't been on one for a few years so don't know if the same type is still used. The 321s also used to have a fairly noisy compressor although a different type to the 315 but I haven't heard that recently.
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Loud Compressors
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Aictos
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The ones used on the 313s are noisy, been told they can drown out a PA announcement!
Now I have a query about PEP compressors, can anyone tell me if the same compressor is used for all the PEP class ie the 313s, 314s and 315s?
Now I have a query about PEP compressors, can anyone tell me if the same compressor is used for all the PEP class ie the 313s, 314s and 315s?
YesToHS2
Member
508s definitely. Doesn't help that the floors seem so unsubstantial.
Peter Mugridge
Veteran Member
455s are quite noisy...
asylumxl
Established Member
Some 319s are louder than others. Substantially louder. 
tom1649
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Though not strictly main line stock, the Metropolitan Line 'A' Stock has extremely loud compressors.
GospelOak117
Member
315's still churn up a good racket, perhaps more so in old age, but IMO 455's are the best for an old sound though with their reconditioned 4SUB and HAP traction motors and compressors; i'd strongly recommend a ride on those.
I'm unsure as to whether 456's also use old SUB motors/compressors.
Oh yeah, those too
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Do the 321s still have the London Underground noise type compressors? I've not heard a compressor on one of them for years as I said above.315's still churn up a good racket, perhaps more so in old age, but IMO 455's are the best for an old sound though with their reconditioned 4SUB and HAP traction motors and compressors; i'd strongly recommend a ride on those.
466.networkers
Member
Networker compressors can be loud, especially on the 466 DBSOs!
O L Leigh
Established Member
Rubbish. Cl315's are quiet compared to a Cl317 compressor, though Cl321's are quieter still. The inertia in a Cl317 main compressor is enough to send vibrations into the cooling rack and set the whole coach buzzing.
O L Leigh
O L Leigh
Peter Mugridge
Veteran Member
Going off topic briefly, I'd really recommend you get over to Paris and try the MS61 stock on RER Line A on the tunnel sections between La Defense and Gare de Lyon. They have to be the most musical units ever built - just make sure you ride in a driving motor; especially try to be in the 3rd carriage from the front or back because that's coupled next to another DM on the next unit. And while you wait at the stations, make sure you're at the back of the platform near the tunnel mouth.
Now that is EMU noise!
Highly enjoyable!{ No idea about the compressors on them though! }
danfitz123
Member
causton
Established Member
313s have really loud compressors and I like the noise - can't wait for my first trip on them for a while soon! :P
(idiot question: what are the compressors used for?)
(idiot question: what are the compressors used for?)
YesToHS2
Member
Braking and air suspension?
O L Leigh
Established Member
...among many other things.
O L Leigh
O L Leigh
They provide air to units that is used for many different purposes: Brakes, doors, air suspension, contactors, pantograph, sanders etc [dependant on what unit uses air for of course].
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