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.
Construction costs Each plan page on our site has a rough cost-to-build estimate based on your state. (see the dropdown list on plan pages). The information in our cost-to-build estimates has been drawn from third-party sources and. Per the third-party sources as mentioned above, costs are based on averages for your area with some being less and some being more. There are many different factors that influence costs so it is best to consult with a builder in your area to get the most accurate estimates.