Were any painted or repainted in the orange and blue color scheme?
No Train Masters were painted in the blue and tangerine scheme; however, some four motor F-M road switchers wore these colors. In 1956, Lionel catalogued its 2341 model of the H24-66 decorated in the blue and tangerine scheme worn by several classes of cab units. The release of this model helped perpetuate the myth at least some prototype TM’s were painted as such. They were not. Inaccuracies notwithstanding, over the decades the 2341 evolved to become one of the premier collector pieces issued during Lionel’s glory years. I hope this helps.
