Although originally built for the Chiltern division of Network SouthEast, the first five Class 165 units (165001 - 165005) were operated by Thames Trains for a few years before reverting back to their former stamping ground in 2004 when they were acquired by Chiltern Railways. During this period, 165002 is pictured departing from Castle Bar Park station with the 13:32 Greenford to Paddington service on 20 April 2002. Just visible in the distance following one block behind is preserved 'Hastings' DEMU 1001 working the Branch Line Society 'Western Essex Express' railtour, which was running late. It should have run in front of the 165, but was now having to crawl behind it and wait while it stopped at the stations!