Gilbert Catalog
Price in 1949: $7.95
Two different tone whistles with separate control buttons. One whistle sounds like near train — other like far away train. $7.95. Denver and west, $8.35.

Price in 1950: $7.95
Taps in creating railroad atmosphere! Has TWO Whistles — one sounds like distant train, other sounds like speeding train close by! Each Whistle has separate control buttons. A remarkable accessory!
Price, $7.95. Denver and West, $8.25.