Definitions

1. noun

a small steam engine or a small portable steam engine, especially one used as a locomotive on a short railway.

“The museum had a collection of old dinkeys on display.”

2. noun

a short railway or a narrow-gauge railway, especially one used with a dinkey engine.

“The tourist took a ride on the historic dinkey line.”

3. noun

a small, often ornamental, railway engine, typically used on a miniature railway.

“The toy store sold model trains with a detailed dinkey engine.”