Locomotive-Specs is an online reference database for railway vehicles, bringing together technical information on more than 10,000 locomotives, multiple units, trams, railcars and other train types from 995 manufacturers across 54 countries. Its model-specific records cover nearly two centuries of railway history, from early steam locomotives to modern high-speed and hydrogen trains. Each specification sheet presents details such as top speed, power output, tractive effort, weight, dimensions, axle arrangement, track gauge, electrification systems, construction years and operators.

Measurements are provided in metric units alongside imperial equivalents to support comparisons across countries and vehicle types. Visitors can explore the collection by manufacturer, train type or country, or use rankings to discover records for speed, power and age. The site also offers a glossary and explanatory guides to help readers understand railway specifications and terminology.

Data is compiled from public sources, including Wikipedia and railway enthusiast databases, with sources cited on individual records. Many entries include community-contributed photos. The database is available in multiple languages and welcomes reports of errors for review