Fliers stating committed Donald Trump delegates are distributed to supporters waiting in line before the Republican presidential hopeful holds a campaign rally at the Pennsylvania Farm Show Complex & Expo Center in Harrisburg, Pa., on April 21, 2016. (Mark Makela/Getty Images)

Five states vote in the “Amtrak Primary” on Tuesday in contests expected to be won by Republican presidential front-runner Donald Trump and the Democratic front-runner, Hillary Clinton.

For Republicans, the race for delegates remains a key focus, with Trump hoping to secure the 1,237 delegates needed before the Republican National Convention in Cleveland this July. If they come up short on Tuesday night, Sen. Ted Cruz (R-Tex.) and Ohio Gov. John Kasich — now loosely aligned in hopes of stopping Trump — aren’t expected to be able to win many delegates.

Here’s a quick review at what’s up for grabs Tuesday on the Republican side. Depending on results, Rhode Island and Connecticut could end up awarding delegates to a mix of contenders while the final results from Pennsylvania may not be known until votes are cast on the convention floor:

PENNSYLVANIA:
Seventy-one total delegates: 14 at-large; 54 from the 18 congressional districts; three for Republican National Committee members and a state party leader.

The 14 at-large delegates all go to the winner of the state. The 54 congressional district delegates are directly elected by voters and are officially unbound to a candidate. Winners do not need to announce their intentions, but in most cases, the candidates have said they’ll vote for whoever wins their district.

MARYLAND:
Thirty-eight total delegates: 11 at-large; 24 from the eight congressional districts; three for RNC committee members and a state party leader.

Like Pennsylvania, the 24 Maryland delegates from the congressional districts are also directly elected. But they must vote for the winner in their congressional district. The 11 at-large delegates will be chosen at the Maryland Republican State Convention on May 13 and 14.

DELAWARE:
Sixteen total delegates: 10 at-large; three congressional district; three RNC/party leader.

This is a winner-take-all state – everything goes to whoever wins a majority or plurality, including the three RNC seats.

CONNECTICUT:
Twenty-eight total delegates: 10 at-large; 15 from the five congressional districts; three RNC/party leader.

A candidate gets all 13 at-large and the RNC/leader delegates if he wins a majority statewide. If not, delegates are doled out proportionally to candidates getting at least 20 percent. Congressional district delegates are awarded to whoever wins the district.

RHODE ISLAND:
Ninteen total delegates: 10 at-large; six from the two congressional districts; three RNC/party leader.

This is an open primary – independents can participate. It’s also proportional.

For the at-large delegates: They’re bound proportionally to contenders who get 10 percent or more of the statewide vote. The exact number awarded to candidates will be determined later by the state party.

In the congressional districts: If more than three candidates receive 10 percent of the vote, the three highest vote-getters each receive one delegate. If a candidate receives 67 percent or  more of the vote in a congressional district, they get at least two delegates.

For more details on delegate allocations, we recommend visiting The Green Papers, Frontloading HQ and the state party websites.