Webb concentrated on reducing gross ton miles and to augment net ton miles by increasing full carload lots, and introduced large freight cars and locomotives, heavy track, stronger bridges and efficient practices.

In the early 20th century increasing traffic led the GNRI to consider introducing larger locomotives.

He introduced feedwater preheating on locomotives using the Kirchweger condenser and introduced "Hanoverian standard locomotives" based on the those built by Thomas Russell Crampton and Johann Friedrich Ludwig Wöhlert.

While the other BR regions introduced diesel-electric locomotives the Western Region went its own way by purchasing a complete range of diesel-hydraulic locomotives covering the type 1 to type 4 power requirements.

For mass movement of freight, S.C. Railway has introduced high horsepowered diesel and electric locomotives and high speed, higher axle load Box-N-Wagons.

In the following decades, NSB introduced El 12 and El 15 locomotives.

The Great Central, formerly a cross-country line, was the last main-line railway to enter London in 1899, and within two years Robinson had introduced new and more powerful locomotives for this service.

In the 1930s, the Pennsylvania Railroad, which had introduced electric locomotives because of the NYC regulation, electrified its entire territory east of Harrisburg, Pennsylvania.

He rapidly set about building new and well-equipped workshops at Brighton and introduced new and more powerful locomotives for main-line and suburban passenger and freight services.

Some locomotives were delivered as the small yellow warning panel was introduced, earlier locomotives being given these panels during works visits.