SEPTA Transit Workers Union (TWU) fell silent after crying strike throughout March without action or settlement. But the TWU may be back to join forces with another union that has just threatened to strike. 

The Brotherhood of Locomotive Engineers and Trainmen voted 166-2 to authorize a strike, demanding that President Obama appoint a board to investigate a labor dispute, else they'll stop working as early as June 14. SEPTA's engineers haven't had a contract for four years and electricians have been working without one for five.

While that doesn't have anything to do with April's strike-threat, the TWU, which has yet to sign a contract, has suggested that they may strike at the same time as the engineers. The strikes could drastically interrupt service across all SEPTA platforms — whether subway or regional rail.

According to a Philadelphia Inquirer article from Wednesday, SEPTA may already be short-staffed in its June launch of 24-hour subway service. The strike would only make the issue worse.