Liliput 0-4-0 Diesel (lighter red), Roco 0-6-0 (black) Diesel & Nigel Lawton O&K RL1c (maroon & blue)
Here are some photos showning the size comparison between these locos. Note that the Roco and Liliput locos are HOe (1:87) whilst the Nigel Lawton O&K locos are 009 (1:76).