TORONTO (Reuters) - Toronto's main stock index finished little changed yesterday after a see-saw session as mixed economic news offset the influence of strong earnings from UPS in the US.

Upbeat results and a strong profit forecast from United Parcel Service late on Wednesday helped boost overall sentiment as it was the latest in a string of major US companies to report solid earnings.

The UPS results helped lift transportation shares, including Canadian National Railway, which jumped 1.79 percent to C$63.53. Canadian Pacific Railway was up 0.65 percent at C$59.02.

But on the economic front, US data pointed to a relatively slow economic recovery. Figures showed U.S. manufacturers ramped up production to rebuild inventories in April but that weekly labour numbers remained soft.

The Toronto Stock Exchange's S&P/TSX composite index ended up 7.11 points, or 0.06 percent, at 12,211.52. The index opened in negative territory but quickly turned higher, rising to a near 19-month high, then paring most of the gains.

"We've been all over the the map on the TSX and looks like we're back to square one," said Elvis Picardo, analyst and strategist at Global Securities in Vancouver.

Weakening oil prices also cut into the overall index's gains, with the energy group falling 0.35 percent. Suncor Energy dropped 0.8 percent to C$34.81, while Husky Energy fell 2.32 percent to C$29.43.