Lionel sold kits to convert those smoke bulb turbines and Berkshires to use heater type smoke units. They included the smoke unit, a new boiler front (door), a new smoke stack, light bulb, and new parts for the puffer mechanism. Those conversion kits were available right up through 1969. (The kits themselves are collectable)
I have handled a fair number of 1946 turbines and Berkshires. Very few had been converted.
I think the conversion diminishes the value of the engine.
Original smoke bulbs are around.
In addition, the smoke bulbs have been reproduced, and are good quality.
Avoid the early replacement bulbs, which are just automotive bulbs with a depression in one side. The good reproductions look just like the originals.