The atoms that make up a molecule can be of the same element or different types. Diatomic molecules are a specific class of molecules that consist of two molecules of the same element. If the molecule is composed of atoms of at least two different elements, it is a chemical compound.
The cost of light rail construction varies widely, largely depending on the amount of tunneling and elevated structures required. A survey of North American light rail projects shows that costs of most LRT systems range from $15 million to over $100 million per mile.he cost of 17 miles (27 km) of highway improvements and 19 miles (31 km) of double-track light rail worked out to $19.3 million per highway lane-mile and $27.6 million per LRT track-mile. The project came in under budget and 22 months ahead of schedule.
Level 1 Construction Fundamentals Study Guide. 355. BUDGETING, COSTS, AND COST CONTROL. The Estimate and the Project Budget. The estimate is a static document at a specific point in time (Bid time). The estimate reflects. what the project was bid for and the quantities and unit prices used. The project budget continuously evolves until project completion.