Personally I had 40 + 24/25/26/37/45/47/50/76/Ethel and several steam combinations on BR era railtours & am sure there would have been other variants.
In the preserved era 40145 has worked railtours combined with class 31/42/steam (top n'tail on the ELR), class 33/37/47/52/55, class 50/67 (top n'tail) and class 57 (for heat) all on the mainline.