As commuters in the San Francisco area scrambled to find other ways around as rail service was halted on Friday with workers from the Bay Area Rapid Transit system going on strike over labor issues, there’s some chatter in the industry about pay rates.

Here’s an interesting chart done by the San Francisco Chronicle looking at pay and benefits at seven transit agencies for Boston, New York, San Francisco, Chicago, the D.C. region, BART and Santa Clara Valley. The data is as of June 30, 2013.

Based on hourly pay, for vehicle operators, the Boston transit agency offers the highest pay of $31.88, according to the chart. For transit mechanics, the San Francisco Municipal Transportation Agency offers the highest pay at $38.50.

In the D.C. region, Metro’s largest employee union — Amalgamated Transit Union Local 689 — renegotiated in July a four-year contract with Metro management. Under that deal, Metro’s workers received an 11.4 percent pay raise over the four-year deal.

BART workers and management have been negotiating on wages, pensions and health care. The rail system of BART carries 400,000 passengers a day.