Dollar volume moving across the bank, by rail, over time. Net (signed sum — flows into the bank are positive) and gross (sum of absolute values — total handle, regardless of direction) live side by side; the per-rail bar shows where the volume is coming from.
Σ signed amount across the period — positive = inflow to the bank, near zero = balanced rails, negative = net outflow
Total handle — sum of per-transfer dollar magnitudes regardless of direction
Each day's gross dollar volume, stacked by rail_name
Total gross dollar volume over the period, per rail_name