I call it, "Ivatt in the weeds." An Ivatt 2mt 2-6-2 tank engine leads an excursion train from Titfield to Mallingford, UK, with a rake of 1927 Great Western Railway stock.
Say Casper, can I call you Casper? Do you know if the black smoke is available on another website, besides the DSL? That's a very nice effect and wonderful screen shot, BTW.