Two types of light source were used, a thousand watt projection lamp and an AH6 high pressure mercury arc.

Two major types of fully distributed cost analysis

Two types of punched cards used to program the machine.

Two F-14 Tomcats of the Islamic Republic of Iran Air Force | IRIAF, armed with different types of air-to-air missiles, including AIM-54 Phoenixes.

Two types of bone can be identified microscopically according to the pattern of collagen forming the osteoid ( collagenous support tissue of type I collagen embedded in glycosaminoglycan gel ):

* Brake equipment: Two main types are used: brake shoes that are pressed against the tread of the wheel, and disc brakes and pads.

Two common types of employee crime exist: embezzlement and sabotage.

Two types of crystallographic defects.

Two liquids can form different types of emulsions.

Two main types of filter media are employed in the chemical laboratory — surface filter, a solid sieve which traps the solid particles, with or without the aid of filter paper ( e. g. Büchner funnel, Belt filter, Rotary vacuum-drum filter, Cross-flow filters, Screen filter ), and a depth filter, a bed of granular material which retains the solid particles as it passes ( e. g. sand filter ).

Two common types of engineered design for anchoring floating structures include tension-leg and catenary loose mooring systems.

Two major types of hydrological models can be distinguished:

Two ’ s complement arithmetic is convenient because there is a perfect one-to-one correspondence between representations and values ( in particular, no separate + 0 and − 0 ), and because addition, subtraction and multiplication do not need to distinguish between signed and unsigned types.

Two types of ink were prevalent at the time: the Greek and Roman writing ink ( soot, glue, and water ) and the 12th century variety composed of ferrous sulfate, gall, gum, and water.

Two types of climate are found in Jamaica.

Two courses of red yarn illustrating two basic fabric types.

Two dwarf species, named Orcinus nanus and Orcinus glacialis, were described during the 1980s by Soviet researchers, but most cetacean researchers are skeptical about their status, and linking these directly to the types described below is difficult.

Two types of coprocessors were defined, the floating point unit ( MC68881 or MC68882 FPU ) and the paged memory management unit ( MC68851 PMMU ).

Two other types of acquired resistance rarely seen include the production of drug-inactivating enzymes ( esterases or kinases ), as well as the production of active ATP-dependent efflux proteins that transport the drug outside of the cell.

Two different types of cost are important in microeconomics: marginal cost, and fixed cost.

Two types of inland river barges were generally available in Europe for use in Sea Lion: the peniche, which was 38. 5 metres long and carried 360 tons of cargo, and the Kampine, which was 50 metres long and carried 620 tons of cargo.

Two French voice types, premiere dugazon and deuxieme dugazon, were named after successive stages in the career of Louise-Rosalie Lefebvre ( Mme.

Two types of ring are used: the upper rings have solid faces and provide gas sealing ; lower rings have narrow edges and a U-shaped profile, to act as oil scrapers.

Two types of deviations from linearity may be considered here.

" Two important types of future interests are:

* 2004 – Two fuel trains collide in Ryongchon, North Korea, killing up to 150 people.

Two high-speed TGV trains at Gare de l ' Est | Paris-Gare de l ' Est

* 2005 – Glendale train crash: Two trains derail killing 11 and injuring 200 in Glendale, California, near Los Angeles.

* 2009 – Washington Metro train collision: Two Metro trains collide in Washington, D. C., USA, killing nine and injuring over 80.

* 1950 – Two Canadian National Railway trains collide in northeastern British Columbia in the Canoe River train crash ; the death toll is 21, with 17 of them Canadian troops bound for Korea.

* April 20 – Sunshine train disaster: Two trains collide in Melbourne, Australia, killing 44 people and injuring more than 400.

** Two trains crash at Hunan, China ; 126 are killed.

** Two trains collide in Turkey ; 95 die.

* January 4 – Two trains collide in Sangi, Pakistan, killing between 200 and 300 people and injuring an estimated 700 others.

** Two commuter trains collide head-on on the outskirts of Jakarta, Indonesia ; 102 are killed.

* May 8 – Versailles train crash: Two trains collide near Paris and catch fire, killing 59.

Two -, three-and four-car tube trains then worked the branch.

Two such " dying pulse trains " were observed, which is consistent with the existence of a black hole.

Two trains could be on the same track at the same time and crash.

Two trains a day from Indianapolis, and two from Effingham, brought freight, mail, and passengers.

Two ERL trains collided at Kuala Lumpur Sentral, Of the trains involved one of them was about to depart at 9. 45pm for Kuala Lumpur International Airport while the other train, which was empty, rammed into its rear.

Two major trackage lines of the Burlington Northern-Santa Fe Springfield Division converge at Turrell ( the Thayer South and the River subdivisions ), which funnel trains from the Springfield, Missouri yard, and the St. Louis yard, respectively, to Turrell.

Two Chicago, Burlington and Quincy Railroad trains, the Advance Flyer and the Exposition Flyer, collided ' head to tail ' on a single track just west of the Loomis Street grade crossing.

Two Gladstone Branch trains each weekday morning offer one-seat rides to Manhattan, and two evening trains leave New York and stop at both of New Providence's stations on the way to Gladstone.

Two steam trains collided head-on.

Two direct trains to from Bridgnorth operated by Chiltern Railways ran in 2009, one on August 15 and one on November 28.

Two trains per hour from Birmingham New Street – London Euston via Northampton was replaced by one train per hour to Northampton which connected badly with onward services to London Euston, although a few trains a day did run straight through to London from Birmingham.