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My Thomas Built Buses Diecast Promotional Scale Model Bus Collection
Thomas Built Bus Promos
Thomas Built Buses Promotional Bus Models
These appear to be promotional models commisioned by Thomas Built Buses.  Heavy cast metal construction with free rolling wheels on rubber like tires.  An unusual feature on these buses is that they do not have transparent windows, rather the windows are part of the main body casting and are then painted.  
 

HDX Transit Coach
thomas built buses saf-t-liner hdx school bus transit coach 1:54 scale die cast model thomas built buses saf-t-liner hdx school bus transit coach 1:54 scale die cast model
Livery:
Saf-T-Liner HDX
 

ER Transit Coach
thomas built buses transit liner hdx transit coach bus 1:54 scale die cast model thomas built buses transit liner hdx transit coach bus 1:54 scale die cast model
Livery:
Transit Liner
 

thomas built buses saf-t-liner er school transit coach bus 1:54 scale die cast model thomas built buses saf-t-liner er school transit coach bus 1:54 scale die cast model
Livery:
Saf-T-Liner ER
 

Saf-T-Liner C2
thomas built buses saf-t-liner c2 school bus white roof 1:54 scale die cast model thomas built buses saf-t-liner c2 school bus white roof 1:54 scale die cast model 
thomas built buses saf-t-liner c2 school bus white roof 1:54 scale die cast model Missing
Livery:
Saf-T-Liner C2