|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 DMSL+MS+DMSL or
The original five Class 168/0s are 4-car sets based on the Networker cab design (they were originally 3-car but were strengthened to four), the subsequent and later built 168/1s and 168/2s use the Turbostar design and are very similar to the Class 170. These two sub-classes are a mixture of three and four 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 has being strengthened with a new sub-class 168/3 formed by transferred Class 170s from Trans Pennine Express .
|Chiltern 168 111 at Haddenham & Thame Parkway|
|168 003 at High Wycombe|
|168 325 passes through Lapworth|
|168 109 at Chalfont & Latimer|
|168 113 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