Were Texas Special units made in plastic or are the Hallmark brass ones the only ones? Proto 2000 did a boat load of E units 25ish years ago, but they weren't plated, I don't think. Did the Hallmark units run well? How much do the cost on average? It would be nice to have a pair (A-B or A-A--either is fine with me) and they would look good on our west Texas layout. Thanks in advance.