A dependable first locomotive
Your first locomotive should run smoothly at low speed and negotiate your layout reliably. A dependable mid-priced locomotive is usually more satisfying than several inexpensive locomotives that constantly derail or stall.
Rolling stock
Freight cars should have free-rolling wheels, properly adjusted couplers, and appropriate weight. Passenger cars are longer and usually need broader curves.
Couplers
Compatible couplers are essential. Many North American modelers use knuckle-style couplers. Correct coupler height prevents unwanted uncoupling.
Match equipment to your layout
A huge articulated steam locomotive or modern six-axle diesel may look impressive but can be frustrating on tight curves. Choose equipment that your physical layout can support.
Build a Consistent Fleet
A railroad becomes more convincing when locomotives and cars share a general railroad, region or time period. You can still run favorites while giving the collection a recognizable identity.
Check minimum curve recommendations before buying long passenger cars, large steam locomotives or modern six-axle diesels.