The 'X' is a variable factor, it does not mean the same thing in all instances.In the case of the OP, Mr.Brown instance, Bob Bartizek tis correct. The 2657X is equipped with 2 couplers, instead of the standard 1 coupler for a steam switcher set. In the case of the 3361 log dump car the 'X' indicates the receiving bin was not included in the box, rather it was packed loose in the set box. No 'X' the bin was included with the car for separate sale. Also notice the font difference between the 2 cars. The 167x controller the choke coil was of different value for the lower voltage of double 0 motors. As for the the 773, the 'X' means it was for separate sale and a lockon was not included with the locomotive, as locomotives in sets the lockon was packaged with the locomotive. As for the ,1 not sure what symbol meant. As far as an 'X' for uncataloged sets, the practice dates back at least to 1956, and probably earlier.
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