On Track When This Was Spotted

Hence the through glass and apologies for my hand .Today  was busy with distances to be traveled in extreme heat. Praise be for the SBahn.  Leaving 'Berlin - Friedrichsfelde Ost' direction Westkreuz I spotted this painted train .Had a go and this is a blip of something which appeals to me . Would love to be allowed to actually see it close up .Maybe ask the DBahn .They can only say no or maybe yes .
There are so many railway tracks here and looking down the lines it's almost from 'here to eternity'. I like trains and we  do have plenty .