May Day Strike and Mayhem. Eight hours for work, eight hours for rest and eight hours for what you will.. --A slogan of the Eight-hour Day movement. May 1, 1886, was the deadline that unions and other worker organizations set for a national general strike.
On January 31, 2008 the US Navy tested a railgun that fired a shell at 10.64 MJ with a muzzle velocity of 2,520 m/s (8,270 ft/s). Its expected performance is a muzzle velocity over 5,800 m/s (19,000 ft/s), accurate enough to hit a 5-metre (16 ft) target over 200 nmi (370 km) away while firing at 10 shots per minute.
Maximum Speed. Locomotive engines for freight are designed to shut off automatically when they reach 910 RPMs (approximately 70-75 mph). However, freight trains seldom reach that level of operation because of track conditions or speed regulations. Most trains move slower depending on the track level. For instance track 1 classification has a limit of 10 mph while level 4 tracks can support speeds up to 60 mph. For the first decade of the 21st century, freight train speed has varied between 20 and 23 mph.