|Number built:||144 (76 2- and 3-car sets)|
|Engine:||Perkins 2006-TWH diesel (one per car)|
|Power:||700 / 1, 050 hp (520 / 780 kW)|
|Formations:||165/0: Driving Motor Standard Lavatory (DMSL)+
Motor Standard (MS)+Driving Motor Standard (DMS)
165/1: Driving Motor Composite Lavatory (DMCL)+MS+DMS
There are 2 sub-classes. the 165/0 was originally built for Chiltern services on Network South East and remains on the same routes including services from Marylebone to Birmingham, to Aylesbury and to Stratford-upon-Avon. Trip-cock equipment has been fitted to Chiltern units as they travel on London Underground track between Harrow-on-the-Hill and Amersham.
165/1 was built for services out of Paddington along the Great Western main line. They are still in service on Thames Valley services to destinations like Oxford and Banbury. They have bogie modifications to allow for a higher top speed (90 mp/h as opposed to 75 mp/h on the 165/0).
|GWR 165 123 at Tackley|
|Chiltern 165 002 at Bicester North|
|Chiltern 165 022 at Aylesbury|
|Chiltern 165 019 at Lapworth|
|Aboard a Chiltern 165|
|GWR 165 106 at Oxford|
 Colin J Marsden, DMU and EMU Recogition Guide (Ian Allan, 2013) p. 149