San Carlos, Calif.-based rail operator Caltrain is asking passengers for help in its quest to raise funds to prevent rail suicides. The fundraising efforts, spearheaded by three Amtrak employees who work on the Caltrain line, aims to raise $3,000 for the Out of Darkness Overnight Walk July 22-23 in San Francisco. The 20-mile walk raises funds for the American Foundation for Suicide Prevention. Caltrain passengers will be asked to chip in their spare dollars and cents during the morning commute on Thursday, July 13. Money accrued from the fundraiser will help educate people on how to detect early thoughts of suicide and how to prevent it. So far, the team has collected more than $1,750, mostly through online donations via the Website for the walk at www.theovernight.org. People can contribute to any or all of the rail teams by clicking on "Support a Participant," then selecting the "San Fransciso Walk" and the "Caltrain Amtrak" team to find the individual members.