Tesco trains are run by DRS and DBS.
DB Schenker use their 92 to haul a daily container from Daventry (was Rugby) to Mossend (Scotland). It travels nirth in the mnorning and south in the evening. They painted 92017 in Stobart colours and named it "Bart the Engine" (if anyone remembers my first avatar). They also painted 66048 in these colours with the name "Bart the Engine" but after working the first Inverness to Mossend train under the DBS contract it derailed and today is stored at Toton, not very intact! Now DRS run that train. 92017 is currently stored :cry:
DRS use their 66s (and now becoming 57s) to haul regular container trains from Daventry to Coatbridge and Mossend. These run in connection with Malcolm Group. There are also Daventry to Wentloog (Cardiff), Mossend to Inverness and Daventry to Tilbury Stobart trains.
Separate containers are run in DRS, with Tees Dock to Ditton an example.
Other than 66048 and 92017, 66411 and 66414 have carried Stobart colours but these have now lost the colours and are presently running with Freightliner (66411 in Poland). 66434 carries Malcolm Rail colours. Although, I do not remember a mention of ASDA liveried 66 (might be like the London Midland 86), 66419 is now in DRS Compass colours running with Freightliner.
Hope this helps, Sam.