703-10 Smoke Bulb - Above you will find a two view stock picture of a new old stock 703-10 smoke lamp. When Lionel first introduced locomotives that smoke, they were equipped with smoke chambers and a special bulb designed with a cup to hold a smoke pill. As the bulb heated the pill, the pill melted producing smoke vapor. We only have a few of these available. In 1947 Lionel updated the bulbs to 18v but that is plainly marked on the box. The boxes may differ slightly, but all are the same quality. Did you know that Lionel had planned to release a scale Hudson prior to the 773, and its number was to be 703?