Midland Great Western Railway 2d dull green

Midland Great Western Railway, 1891 2d dull green used on a cover from Ballywillan to Cavan with pen cancels only, either collected at Cavan Station or possibly delivered by hand by a station porter (against regulations). Ballywillan Station was three stops from Cavan. DeLacy-Spencer #1, Hib. R119.
The enclosed letter was written at Colloboy in 1896 with "...please answer by this evenings (sic) train". This cover and letter clearly demonstrate use of the express letter service offered by the railway companies.