Don’t forget that many/most “larger” passenger stations would need ice for passenger car A/C (obviously depending on whether cars that used ice AC would, or could, pass thru and need it at that point).  I’m sure the passenger depts. of the railroads would plan out where icing would be needed, and therefor which stations needed the facilities.

So the only additional equipment needed for express reefers would be the lift truck to get the ice up to the roof level.