Railroad track powered measurement device and railroad measurement system

1. A railroad track powered measurement device comprising:

a measurement circuit operably coupled between rails of a railroad track and adapted to measure electrical quantities across the rails and to provide measurement signals of the electrical quantities;

a communications processor adapted to interface with one or more of the rails and to transmit, via the one or more rails, the measurement signals of the electrical quantities to a transmitter of a wayside control device, the transmitter being disposed on the one or more rails, wherein the one or more rails provide a serial communications link between the measurement device and the transmitter; and

an energy storage unit adapted to harvest and store electrical energy, the electrical energy being transmitted over the rails of the railroad track, wherein the energy storage unit is adapted to harvest the electrical energy from at least one of the rails of the railroad track.

2. The railroad track powered measurement device of claim 1 , wherein the electrical quantities comprise voltage and current, wherein the measurement circuit is adapted to measure voltage and current present at the rails of the railroad track.

3. The railroad track powered measurement device of claim 2 , wherein the signal processing circuit is adapted to demodulate coded track signals across the rails of the railroad track.

4. The railroad track powered measurement device of claim 1 , further comprising:

a signal processing circuit coupled to the measurement circuit and adapted to process the measurement signals of the electrical quantities.

5. The railroad track powered measurement device of claim 4 , wherein the signal processing circuit is adapted to calculate speed, position and acceleration of a railway vehicle travelling on the railroad track, and to determine that the railroad track is occupied or unoccupied.

6. A railroad measurement system comprising:

a railroad track powered measurement device providing measurement signals of electrical quantities across rails of a railroad track;

a wayside control device comprising a transmitter, the transmitter being disposed on one or more of the rails and being adapted to receive the measurement signals provided by the railroad track powered measurement device; and

a communication network interfacing with the railroad track powered measurement device and interfacing with the one or more of the rails, the communication network being adapted to transmit data via the one or more rails, wherein the one or more rails provide a serial communications link between the measurement device and the transmitter,

wherein the railroad track powered measurement device is adapted to transmit the measurement signals of the electrical quantities via the communication network, and the transmitter of the wayside control device is adapted to receive the measurement signals, the railroad track powered measurement device comprising:

an energy storage unit adapted to harvest and store electrical energy, the electrical energy being transmitted over the rails of the railroad track, wherein the energy storage unit is adapted to harvest the electrical energy from at least one of the rails of the railroad track.

7. The railroad measurement system of claim 6 , wherein the railroad track powered measurement device comprises:

a measurement circuit operably coupled between the rails of the railroad track and adapted to measure the electrical quantities across the rails; and

a communications processor adapted to communicate, via the communication network, the measurement signals of the electrical quantities to the transmitter of the wayside control device.

8. The railroad measurement system of claim 7 , wherein the railroad track powered measurement device further comprises:

a signal processing circuit coupled to the measurement circuit and adapted to process the measurement signals of the electrical quantities.

9. The railroad measurement system of claim 8 , wherein the signal processing circuit is adapted to calculate speed, position and acceleration of a railway vehicle travelling on the railroad track.

10. The railroad measurement system of claim 8 , wherein the signal processing circuit is adapted to demodulate coded track signals across the rails of the railroad track.