People questioned Frankel when he asked his sprinter - Ghostzapper - to go two turns. Worked out okay for him if I remember correctly
. Granted the Zapper was bred to go long being by Awesome Again and out of a Relaunch mare. Silver Train is by Old Trieste (Sinister Minister, Minister Eric), the speedster lethal at up to 9f in his career against lesser and very talented on his day. Also, Silver Train is out of a mare by Cormorant who is the oldest living sire of a Kentucky Derby winner (Go for Gin) and also sired Gander who knew his way around two turns. Personally I like the decision of keeping him at Belmont and trying to go longer. He could cap at 9f or so but I think with some luck he can get 10f.
~dustin