Two Pittsburgh railroad companies -- Wabtec and L.B. Foster -- today reported second quarter earnings and revenue increases at a breakneck pace.

Wilmerding-based Wabtec, which manufactures rail technology products, raised its guidance for the year to earnings per share of $2.15 and sales growth between 16 to 18 percent, from an earlier guidance of earnings per share of $2.10 and sales growth between 12 and 14 percent.

L.B. Foster, a Green Tree-based manufacturer of products for the rail, energy and construction industries, saw a 117 percent increase in earnings per diluted share from the year-ago quarter, to 63 cents from 23 cents. The company earned $6.8 million in net income in its tenth consecutive quarter of earnings increases.

Revenue at L.B. Foster also grew 50 percent, to $148.5 million from $99.3 million in the prior-year quarter.

At Wabtec, earnings per diluted share increased 33 percent from the year ago quarter, to 57 cents from 43 cents. That figure, on net income of $28.1 million, beat the Wall Street consensus of 54 cents per diluted share.

Revenue jumped 24 percent from the year-ago quarter to $326 million, which the company attributed to a growing transit market and continued strong demand from freight products.