Hurricanes pose a severe threat each year during the June 1 to November 30 hurricane season, particularly from August to October. Florida is the most hurricane-prone state, with subtropical or tropical water on a lengthy coastline. Of the category 4 or higher storms that have struck the United States, 83% have either hit Florida or Texas. From 1851 to 2006, Florida was struck by 114 hurricanes, 37 of them majorcategory 3 and above. It is rare for a hurricane season to pass without any impact in the state by at least a tropical storm.[citation needed]
What percentage of category 4 storms hit Florida
category 4 or higher storms that have struck the United States, 83% have either hit Florida or Texas

South Tucson is actually the name of an independent, incorporated town of 1 sq mi (2.6 km2), completely surrounded by the city of Tucson, sitting just south of downtown. South Tucson has a colorful, dynamic history. It was first incorporated in 1936, and later reincorporated in 1940. The population consists of about 83% Mexican-American and 10% Native American residents. South Tucson is widely known for its many Mexican restaurants and the architectural styles which include bright outdoor murals, many of which have been painted over due to city policy.
When was South Tucson reincorporated?
1940

A railway electrification system supplies electric power to railway trains and trams without an on-board prime mover or local fuel supply. Electrification has many advantages but requires significant capital expenditure. Selection of an electrification system is based on economics of energy supply, maintenance, and capital cost compared to the revenue obtained for freight and passenger traffic. Different systems are used for urban and intercity areas; some electric locomotives can switch to different supply voltages to allow flexibility in operation.
How do some locomotives function in order to be more flexible in operation?
can switch to different supply voltages