Below is a new rendering of the bridge over the CSX tracks that will connect Riverdale Park Station and M square in Riverdale Park.
It looks to me like the bridge has bike lanes, but those might just be wide shoulders. At the very minimum it has wide sidewalks. The west side of the bridge (on the left) will end at a "Village Green" one block from the new section of the PG County Trolley Trail. On the east side it will end at Tuckerman (I think), about 4 blocks from the NE Branch Trail. In the plan below, it is on the right side, with trail near the middle.
The text that goes with the top rendering.
Closure of Parking Lot of Former ERCO Plant Between the Rivertech Court Cul-de-sac and Lafayette Avenue in Riverdale Park
Work will soon begin on the much awaited new CSX crossing at Riverdale Park Station. The bridge construction work is significant and requires the closing of the former ERCO plant parking lot between the Rivertech Court cul-de-sac and Lafayette Avenue. This route has been used for years as a “short cut” from Lafayette Avenue to M-Square. The closure will begin on or about December 14, 2015 and will continue until the new bridge is open – estimated to be in April 2017.
The initial construction activities include the relocation of existing electrical and gas utilities that run parallel to the CSX tracks. Utility relocations are necessary for the construction of the new bridge over the CSX railroad tracks