Answer:
Consolidation is the action of making something stronger and more solid. (This could also mean combining different things to make a larger whole thing)
Step-by-step explanation:
The dominant national trend in railroad management and finance starting around the 1880s was 'consolidation'. By purchase, lease, or trust arrangements, the larger railroad systems absorbed smaller lines, and other major railroad companies expanded their reach and hold on railroads.
Hope this helps and makes sense :)