The story
By surface analysis, rail + banking, or, by surface analysis, railbank + -ing.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: The practice (by investment firms) of holding a disused railroad right of way in reserve rather than immediately redeveloping or selling it; this may include converting it into a rail trail for public use either in the meantime or in perpetuity. Full definition →
By surface analysis, rail + banking, or, by surface analysis, railbank + -ing.
Etymology from Wiktionary, CC BY-SA 4.0.