1 The water table forms the top of the zone of saturation, where pore spaces in sediment or rock are completely filled with water. 2  Aquifers are underground areas of sediment or rock that hold groundwater. 3  In steep areas, where groundwater intersects the ground surface, a spring or seep can form.
There's a word for what you're asking for-- onomatopoeia. Many times editors would rather you not use the sounds, but describe it, unless you're writing a PB or even early chapter book. I wrote about a train in one of my short stories. As a train gets closer, it makes a rumbling sound. As it leaves the station, it makes a steadily increasing chugging sound. The whistle sounds like a forlorn call in the night. The brakes hiss and screech when the train slows down to a stop. If you don't have a train nearby to listen to, go online and do a search.
Trains no longer have cabooses because in the 1980s they developed a device called EOT commonly known as End of Train device it monitors brake pressure and is monitored in the cab by the engineer in the event of an emergency the engineer throws a switch and applies the brakes on the train.he crew in the caboose kept an eye on the train in front of them to watch for hot-boxes (over-heated axle bearings) and other problems. Now there are trackside hotbox and dragging equipment detectors (automatic), and trains use roller bearings as opposed to the old friction bearings.