Tiebar,
No, you have simply run into old Triang which had back to back set narrower, due largely to thicker flanges; also note the wider tyres than are typical of current production. This stuff was made to work on the very coarse type 3 and super 4 track of the 1960's. Best way to adjust the wheels is to use a punch one eighth inch diameter on the insulated side of the wheel set, a light tap with a hammer will open out the back to back, without the risk of introducing wobble by levering the wheels apart.
No, you have simply run into old Triang which had back to back set narrower, due largely to thicker flanges; also note the wider tyres than are typical of current production. This stuff was made to work on the very coarse type 3 and super 4 track of the 1960's. Best way to adjust the wheels is to use a punch one eighth inch diameter on the insulated side of the wheel set, a light tap with a hammer will open out the back to back, without the risk of introducing wobble by levering the wheels apart.
