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Hello

I  dont  think  any  M7s  were  air  braked.

Isle  of  Wight  02s  were  though  (2  had  push  pull  equipment) and  obviously  many  LBSC  locos.

 

The  air  supply  for  brake and  control  is  all  from  the  same  Westinghouse  pump.

This  fed  a  storage  reservoir  which  supplied  air  to  the  drivers  brake  valve  and  the  control  system.

 

A  vacuum  braked  engine  with  air  push  pull  equipment  would  normally  have  a  small  Westinghouse  pump  as  it  supplies control  air  only.  An  air  braked  engine  would  normally  have  a  larger  pump  as  a  lot  more  air  is  needed.

 

Air  is  supplied  from  the  storage  reservoir  to  both  the  engines  cab  and  the  cab  of the  driving  trailer

The  control  air  system  operates  via  a  control  valve  operated  by  the  driver  when  in  the  Driving  Trailer,  this  activates  a  dual  acting  air  cylinder  on  the  engine  which  moves  the  regulator.  An  air  whistle  is  also  fitted  to  the  Driving  Trailer. 

The  fireman  remaining  on  the  engine  would  operate  the  reversing  leaver  according  to  bellcode  instructions  from  the  driver.  The  Driving  Trailer  also  uses  the  storage air  to  supply  a  standard  Drivers  Brake  valve  which  operates  the  train  brake.

 

When  working  engine  first  the  pin  connecting  the  push  pull  operating  cylinder  to  the  regulator  is  removed  and  the  engine worked  normally.

 

Pete 

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