A Class 165/172 combination at Oddington on 26 August 2019. 165025 & 172101 are working the 1Y10 08:43 Oxford to Marylebone Chiltern Railways service. Although they look similar, 18 years separates these two units. There are other considerable differences, as the Class 165s were constructed by BREL/ABB at York, and have hydraulic transmission, whereas the Class 172s were assembled by Bombardier at Derby, and have mechanical transmission.