Weight of sledge hammer

I'm writing a curriculum on the Chinese building the railroad. I need a small detail: How much did a sledge hammer weigh? If no one can answer that question, can you direct me to someone who can? Thank you.

Travel in 1870 by rail

From: "Bill McIntyre" bill@canadian-biocoal.com, billmci@telus.net

I am in the process of writing a screenplay that involves getting a character from Chicago to Washington State in 1870 by rail. If that was impractical then I would shift his destination to Oregon or California. He would still have to reach Washington by some other means. He would want to ship his horse and pack mule with him as well. If this was possible in whole or in part what would have been the travel time? ...

—Bill McIntyre