|Number built:||67 (19 3 or 4-car sets)|
|Builder:||Adtranz Derby later Bombardier Derby|
|Engine:||MTU 6R183TD13H diesel per car|
|Power:||1, 688 hp (1, 260 kW) or 1, 266 hp (945 kW)|
|Formation:||Driving Motor Standard Lavatory (DMSL)+Motor Standard Lavatory (MSL)+
Motor Standard (MS)+DMSL or
The original 5 Class 168/0s are 4-car sets based on the Networker cab design (they were originally 3-car but were strengthened to 4), the subsequent and later built 168/1s and 168/2s use the Turbostar design and are very similar to the Class 170. These 2 sub-classes are a mixture of 3 and 4 car sets.
The Class 168s are fitted with trip cock equipment as they share lines with London Underground stock on the Harrow-on-the-Hill to Amersham route. This equipment applies the brakes if a LU signal is passed at danger .
The Chiltern fleet is being strengthened with a new sub-class 168/3 formed from transferred Class 170s from Trans Pennine Express .
|Chiltern 168 001 at Leamington Spa|
|Chiltern 168 110 at Princes Risborough|
|Chiltern 168 004 at Hatton|
 Colin J. Marsden, DMU and EMU Recognition (Ian Allan, 2013) p. 154
 Gavin Morrison, British Railway DMUs in Colour (Ian Allan, 2010) p. 45
 Colin J. Marsden (ed.), "Class 168 Clubman", Modern Locomotives Illustrated No. 216 December 2015-January 2016 (Second Generation DMUs Classes 165-185) p. 22
 "TPE goes for new loco-hauled trains for new franchise", Today's Railways UK No. 173 May 2016