Maryland Gov. Larry Hogan announces in June that the Purple Line will go forward. (Patrick Semansky/AP)

Gov. Larry Hogan on Wednesday urged members of the state’s congressional delegation to help secure federal funding for the Purple Line and notified them that the state and local contributions are finally in place.

Hogan (R) sent a letter to Sen. Barbara A. Mikulski (D), the group’s senior member, informing the lawmakers that Montgomery and Prince George’s counties met a critical demand from the state by agreeing to spend tens of millions of dollars more on the project.

“Your continued support will ensure that the hard-working citizens of Maryland will have access to long-term jobs, community development, and economic growth,” Hogan said.

The governor issued a similar plea to the delegation in July, about one month after agreeing to move forward with the 12-mile transit line that would run between New Carrollton and Bethesda in the Washington suburbs.

The agreement between the counties and the state leaves federal funding and private investment as the last major pieces of the financing puzzle to be resolved before advanced planning and construction of the estimated $2 billion transit line can begin.

The governor’s approval of the project came with conditions: He altered the plans to trim costs, reduced the state’s initial contribution by more than 75 percent and asked the counties to pledge more money. In addition to the $900 million expected from the federal government, funding must come from private investors.

The state has committed $168 million — down from $700 million during the previous administration — and the counties have pledged more than $340 million.

Maryland officials won’t know how much financing the private sector is willing to kick in until they receive bids in November, but Transportation Secretary Pete K. Rahn has said the state expects at least $670 million. Once financing is in place, construction could begin as early as May.

As part of the agreement with Prince George’s, the state agreed to hold the ribbon-cutting and groundbreaking ceremonies for the Purple Line within its borders. The state also agreed to build the Purple Line’s operations center in New Carrollton.

Prince George’s demanded concessions partly based on the premise that the state had shortchanged the jurisdiction on mass-transit developments for many years, according to a letter Prince George’s County Executive Rushern Baker III (D) sent to Rahn.

The jurisdiction’s total pledge — including in-kind contributions — amounts to $130 million, compared with $217 million for Montgomery.

Katherine Shaver contributed to this report.